Bill,
To tell the truth, Stocky preferred to fight in a Spitfire. No one likes to be at the bottom of a "bounce" all the time.
I haven't flown either the Spitfire or the Hurricane. But one of our pilots, Rob Erdos, has flown the "hat trick" -- Spit, Hurri, and 109 all in one year. And this year he got checked out in the P-40. He's also the Chief Test Pilot at the National Research Council in Ottawa, so superberbly qualified to comment.
Regarding fuel burn, yes, when you put a second cockpit in place of the fuselage tank, you get limited. We have a belly tank, like John Paul, but since we don't want to drop it on the Canadian countryside, it's not always such a handy thing. If I arrive at an airshow with it I have to remove it, and thus it has to be empty, and I need another set of hands (which I don't always have). Easier to make an enroute fuel stop.
Here's the page out of the P-40N manual.

I fly it according to the bottom right corner. I get a little better performance because we have a V-1710-81A engine, and the "A" means a slightly smaller supercharger ratio. This translates to reduced high altitude performance, which I don't need, for less supercharger load on the crankshaft at low altitudes and power settings, which I do need.
Judy Pay has a Merlin P-40 down under.
Dave